Masayuki Nakano 5423cae57c Bug 1560396 - Replace EditorBase::GetNodeAtRangeOffsetPoint() with new API in EditorDOMPointBase r=m_kato
It's a static method and called only with `EditorDOMPointBase` instances.
So, we can add new API to `EditorDOMPointBase` instead.

Note that it's changed to return container when the container is a data node
rather than a text node.  This should be better because no data node can
have children.

Depends on D117382

Differential Revision: https://phabricator.services.mozilla.com/D117490
2021-06-11 08:57:18 +00:00
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